y^2-9(x+y)^2.a(x-y)-b(y-x)+c(x-y)..x（m+n)-y(n+m)+(m+n)..(x+y)^2-16(x-y)^2因式分解
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y^2-9(x+y)^2.a(x-y)-b(y-x)+c(x-y)..x（m+n)-y(n+m)+(m+n)..(x+y)^2-16(x-y)^2因式分解y^2-9(x+y)^2.a(x-y)-b(y
y^2-9(x+y)^2.a(x-y)-b(y-x)+c(x-y)..x（m+n)-y(n+m)+(m+n)..(x+y)^2-16(x-y)^2因式分解
y^2-9(x+y)^2.a(x-y)-b(y-x)+c(x-y)..x（m+n)-y(n+m)+(m+n)..(x+y)^2-16(x-y)^2
因式分解
y^2-9(x+y)^2.a(x-y)-b(y-x)+c(x-y)..x（m+n)-y(n+m)+(m+n)..(x+y)^2-16(x-y)^2因式分解
(1) y^2--9(x+y)^2=[y+3(x+y)][y--3(x+y)]
=(y+3x+3y)(y--3x--3y)
=(3x+4y)(-3x--2y)
=--(3x+4y)(3x+2y).
(2) a(x--y)--b(y--x)+c(x--y)=(x--y)((a+b+c).
(3) x(m+n)--y(m+n)+(m+n)=(m+n)(x--y+1).
(4) (x+y)^2--16(t--x)^2=[(x+y)+4(y--x)][(x+y)--4(y--x)]
=(x+y+4y--4x)(x+y--4y+4x)
=(5y--3x)(5x--3y).
y^2-9(x+y)^2.a(x-y)-b(y-x)+c(x-y)..x（m+n)-y(n+m)+(m+n)..(x+y)^2-16(x-y)^2因式分解
通分 a/(y-x)^2,b/(x-y)(x+y)
因式分解a(x-y)+b(y-x)+(2x-y)
a^2(x-y)+(y-x)因式分解
a(x-y)(x+y)-b(y-x)(x+y)-c(x-y)^2(y+x)提取公因式
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
因式分解：(x+y)^3(x-y)-(x+y)(x-y)^3,9x^2-16(a+b)^2
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)
已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
化简y(x+y)+(x+y)(x-y)-x^2
9(x-y)-12(y-x)^2
(x+y)^2+6(x+y)+9
(x+y)^2-9(x+y)+18
因式分解：4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3
因式分解：4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3
方程组2X-Y=9,X+2Y=A,则X:Y=?
（3a^3/X+Y)^3*(X^2-Y^2)除以（Y-X/Y+X)^2